<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>2.1CSS3用border-radius画圆形</title>
    <style>
             .demo{
                  width: 200px;
                  height: 200px;
                  border: 1px solid #ccc;
                   background-color: #F66;
                   margin: 50px auto;
                   border-radius: 50%;
                  /* border-top-left-radius: 100px;*/
             }
    </style>
</head>
<body>
       <div class="demo">

       </div>
</body>
</html>